* {
    margin: 0px;
    padding: 0;
}

.dh {
    width: 100%;
    background-color: #333;
    height: 50px;
}

.dh ul {
    list-style-type: none;
}

.dh>ul>li {
    float: left;
}

.dh ul li a:link,
.dh ul li a:visited {
    text-decoration: none;
    color: #fff;
    display: block;
    width: 160px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background-color: #333;
}

.dh ul li a:hover,
.dh ul li a:active {
    background-color: rgb(179, 171, 171);
}

body {
    font-family: "Microsoft Yahei", sans-serif;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

header {
    font-weight: lighter;
    background-image: url(../素材/images/first.jpg);
    color: #fff;
    width: 100%;
    height: 900px;
    text-align: center;
    margin: 0 auto;
}

.title {
    display: inline-block;
    margin-top: 160px;
    font-size: 64px;
    font-weight: 700;
}


.content {
    margin-left: -650px;
}

.good{
    margin-left: 600px;
    margin-top: -215px;
}

.row {
    margin-top: 100px;
}



.row p{
    font-weight: 700;
}

h1 {
    font-size: 36px;
    margin-bottom: 15px;
    text-align: center;
    color: black;
}



h3 {
    font-size: 20px;
    color: black;
    margin-top: 25px;
    font-weight: 600;
    text-align: left;
    margin-left: 418px;
}

p {
    font-size: 20px;
    color: black;
}

input[type=button] {
    width: 220px;
    height: 55px;
    margin: 3px;
}



#oj,
#csdn,
#baidu,
#study,
#run {
    font-size: 25px;
    color: honeydew;
    cursor: pointer;
    border: 1px solid white;
}

#oj {
    background-color: rgb(141, 141, 240);
}

#csdn {
    background-color: rgb(182, 178, 178);
}

#baidu {
    background-color: rgb(163, 214, 176);
    font-size: 25px;
    color: honeydew;
    cursor: pointer;
    border: 1px solid white;
}

#study{
    background-color: rgb(190, 157, 157);
}

#run{
    background-color: rgb(197, 211, 148);
}


section {
    font-weight: lighter;
    /* background-image: url(../素材/images/four.jpg); */
    color: #fff;
    width: 100%;
    height: 900px;
    text-align: center;
    margin: 0 auto;
}

.second {
    height: 900px;
    padding-bottom: 100px;
}


.in {
    width: 80%;
    height: 450px;
    margin: 0px auto;
    margin-top: 50px;
}

.in div {
    width: 50%;
    height: 120px;
    text-align: left;
    padding-bottom: 20px;
}

.book,
.game {
    float: left;
    text-align: left;
}

.music,
.boll {
    float: right;
}

.in div img {
    display: block;
    float: left;
    padding: 0 15px 80px 20px;
}

.in div h1 {
    padding-bottom: 10px;
}


.like {
    font-size: 40px;
    margin-top: 600px;
    margin-bottom: -300px;
    font-weight: 700;

}

.aa {

    margin-bottom: 35px;
    margin-top: 320px;
}


#third {
    height: 750px;
    width: 100%;
    background-image: url(../素材/images/four.jpg);
    background-size: cover;
    color: white;
    font-weight: lighter;
}

.support {
    width: 100%;
    text-align: center;
    height: 430px;
    float: left;
    padding: 150px 0 0 10%;
}

.support h1 {
    font-size: 60px;
    font-weight: lighter;
    margin-right: 300px;
}

.support h2 {
    font-size: 40px;
    font-weight: 900;
    margin-left: -300px;
    color: white;

}

.support li {
    padding:10px;
    font-size: 30px;
    font-weight: 700;
    color: black;
    margin-left: -300px;
}


#fourth {
    height: 1200px;
    width: 100%;
    background-image: url(../素材/images/second.jpg);
    background-size: cover;
    color: white;
    font-weight: lighter;
}

.crew>div:nth-child(1) {
    padding-top: 50px;
    font-size: 60px;
    font-weight: 700;
}

.crew>div:nth-child(3) {
    width: 30%;
    padding-bottom: 30PX;
    margin: 0 auto;
    font-weight: 600;
}

.crewphoto {
    width: 50%;
    height: 500px;
    margin: 0 auto;
}

.img_div {
    width: 40%;
    position: relative;
    float: left;
    margin: 5%;
}

.who {
    width: 100%;
    height: 375px;
}

.mask {
    background-image: url(img/mask.png);
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    color: white;
    opacity: 0;
}

.mask h1 {
    font-weight: bold;
    padding-top: 10%;
}


.mask:hover {
    opacity: 1;
}

